If you use this method, you will have most of the following issues.
- Bloodmoon will not happen until the next day it is scheduled.
- Traders will not restock until the next day they are scheduled.
- Loot will not respawn until the next time it is scheduled. (unexplored areas would not be affected, but all explored areas would.)
- Plants will not grow until the next growth timer is scheduled to tick.
- Forge timers will be irrecoverably hosed. Must destroy forge to correct.
- POI zeds will not respawn from cleared POI's. (May also affect un-visited areas so that no POI zeds spawn.)
- Biome spawns will not respawn. This includes animals. (May also affect un-visited areas so that no zeds or animals spawn.)
- Airdrops will not fire off until the next scheduled date. (Alternatively there may be multiple planes, or infinitely spawning planes. It's a real roll of the dice on what's going to happen here.)
This isn't just a list of things to scare you either. This is from experience. I test this every build, and the results do not change.
You can get lucky and only have a few of these issues, but most of the time you are going to have the majority of them.